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A003708 Expansion of tan(log(1+x)).
(Formerly M3547)
6
0, 1, -1, 4, -18, 110, -810, 7040, -70280, 792200, -9945000, 137550400, -2077719600, 34026132400, -600433397200, 11356783360000, -229193571984000, 4915556301968000, -111644265232656000, 2676908220027392000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

FORMULA

a(n) ~ n! / (exp(Pi/2) * (exp(-Pi/2)-1)^(n+1)). - Vaclav Kotesovec, Feb 16 2015

MATHEMATICA

With[{nn=20}, CoefficientList[Series[Tan[Log[1+x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, May 28 2013 *)

CROSSREFS

Sequence in context: A214840 A060223 A144085 * A327679 A330353 A000986

Adjacent sequences:  A003705 A003706 A003707 * A003709 A003710 A003711

KEYWORD

sign

AUTHOR

R. H. Hardin, Simon Plouffe

STATUS

approved

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Last modified September 20 19:48 EDT 2020. Contains 337265 sequences. (Running on oeis4.)